Tian wrote:
import ModuleA
classname = "Dog"
module = globals()["ModuleA"]
classobj = ??? <---using classname
instanct = classobj()
classobj = getattr(module, classname)
STeVe
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Su Wei <[EMAIL PROTECTED]> wrote:
> if i want to make a global class to save configuration information of
> app that is read from a xml file,what can i do?
Just put it in a module. Say, 'progconfig.py'. Your configuration
code can then look like:
import progconfig
# parse configuration informat
Su Wei <[EMAIL PROTECTED]> wrote:
> if i have a xml file like this:
>
>
>
>
>
> i want to save this information,and used by other moduls later.
>
> how should i do it? ths
First you need an xml library. There's one built into Python, but
ElementTree is a simpler one: http://effbot.o
Jack Diederich wrote:
>
> itertools to iter transition, huh? I slipped that one in, I mentioned
> it to Raymond at PyCon and he didn't flinch. It would be nice not to
> have to sprinkle 'import itertools as it' in code. iter could also
> become a type wrapper instead of a function, so an iter in
Michael Spencer wrote:
def xgen(s):
srciter = iter(s)
item = [srciter.next()]
for i in srciter:
if i == '/':
item.append(srciter.next())
else:
yield item
item = [i]
yield item
Note that the generator-based solution doesn't generate
Axel Straschil wrote:
I came to the following:
For single inheritance, super is a nice tool if you will recfactoring
the class later.
For multiple inheritance, if you want to use super, you have to have
very much knowledge of the classes you inheritance.
And for multiple inheritance, if you don't
Ville Vainio wrote:
"Raymond" == Raymond Hettinger <[EMAIL PROTECTED]> writes:
Raymond> If the experience works out, then all you're left with is
Raymond> the trivial matter of convincing Guido that function
Raymond> attributes are a sure cure for the burden of typing
Raymond> impo
infidel wrote:
You can use the new 'sorted' built-in function and custom "compare"
functions to return lists of players sorted according to any criteria:
players = [
... {'name' : 'joe', 'defense' : 8, 'attacking' : 5, 'midfield' : 6,
'goalkeeping' : 9},
... {'name' : 'bob', 'defense'
Michael Spencer wrote:
> While we're on the topic, what do you think of having unary,
> non-summary builtins automatically map themselves when called with an
> iterable that would otherwise be an illegal argument:
>
> e.g.,
> int(iterable) -> (int(i) for i in iterable)
> ord(iterable) -> (ord(i) fo
could ildg wrote:
As there is already __init__, why need a __new__?
What can __new__ give us while __init__ can't?
In what situations we should use __new__?
And in what situations we must use __new__?
Can __new__ take the place of __init__?
I believe the current documentation will be updated when 2
Terry Reedy wrote:
"Steven Bethard" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
True it's not a huge win. But I'd argue that for the same reasons that
dict.fromkeys is a dict classmethod, the itertools methods could be iter
classmethods (or staticme
Ron Garret wrote:
Why doesn't this work?
from weakref import ref
class C(str): pass
...
ref(C())
Traceback (most recent call last):
File "", line 1, in ?
TypeError: cannot create weak reference to 'C' object
Note that you don't need the class redirection:
py> ref('')
Traceback (most recent call
Terry Reedy wrote:
But if classmethods are intended to provide alternate constructors
But I do not remember that being given as a reason for classmethod(). But
I am not sure what was.
Well I haven't searched thoroughly, but I know one place that it's
referenced is in descrintro[1]:
"Factoid: __
Ville Vainio wrote:
The issue that really bothers me here is bloating the builtin
space. We already have an uncomfortable amount of builtin
functions. Of course the additions that have been suggested would not
pollute the builtin namespace, but they would still be there, taking
space. I'd rather se
Ron Garret wrote:
Note that you don't need the class redirection:
py> ref('')
Traceback (most recent call last):
File "", line 1, in ?
TypeError: cannot create weak reference to 'str' object
But I don't know why strings aren't valid arguments to ref...
None of the native types (int, float, list,
Ville Vainio wrote:
A minimal set would not be that offensive, yes. But then we would have
two places to look for itertools functionality, which may not be
desirable.
True, though this is currently necessary with str objects if you want to
use, say string.maketrans, so it's not without some prece
Peter Hansen wrote:
I believe it's here: http://docs.python.org/lib/module-weakref.html
if you search for the string "Not all" and read the next two
paragraphs.
On the other hand, it says (there) only that "several builtin
types such as list and dict ... can add support through
subclassing", and do
[EMAIL PROTECTED] wrote:
I need to iterate values by row and column as well.
I tried this
w,x = 32, 16
A = [ [0x0]*w for i in range(x)]
print A
py> import numarray
py> print numarray.zeros((16, 8))
[[0 0 0 0 0 0 0 0]
[0 0 0 0 0 0 0 0]
[0 0 0 0 0 0 0 0]
[0 0 0 0 0 0 0 0]
[0 0 0 0 0 0 0 0]
[
[EMAIL PROTECTED] wrote:
from Numeric import *
# Initialize the 32x16 global array to zeros
tbl = zeros((32, 16)
def getValue( value):
data = test(value)
c1 = data[0]
c2 = data[1]
print tbl[c1, c2]
def test( value):
t1 = 0x0
t2 = 0x1
return tbl[t1, t2]
In test, tbl[0x0,
[EMAIL PROTECTED] wrote:
Steven Bethard wrote:
py> import numarray as na
py> tbl = na.zeros((32, 16))
py> def get_value():
... data = test()
... c1 = data[0]
... c2 = data[1]
... print tbl[c1, c2]
...
py> def test():
... t1 = 0x0
... t2 = 0x1
... retur
Laszlo Zsolt Nagy wrote:
My problem is about properties and the virtuality of the methods. I
would like to create a property whose get and set methods
are virtual.
Perhaps you want to roll your own VirtualProperty descriptor? Here's
one based off the property implementation in Raymond Hettinger'
[EMAIL PROTECTED] wrote:
Thats right. I wanted c1 and c2 to retrieve the values returned by t1
and t2 . Values for t1 and t2 could be anything. Also tbl is global.
Then you need to return t1 and t2 in test, e.g.:
py> import numarray as na
py> tbl = na.zeros((32, 16))
py> def test():
... t1 = 0x
Andrew Koenig wrote:
"Carl Banks" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
Well, Python seems to get along fine without the ability to do
isinstance(foo,file_like_object); probably better off in the end for
it. So I'd say you should generally not do it. Inheritence is for
whe
Steven Bethard wrote:
Laszlo Zsolt Nagy wrote:
My problem is about properties and the virtuality of the methods. I
would like to create a property whose get and set methods
are virtual.
Perhaps you want to roll your own VirtualProperty descriptor? Here's
one based off the pro
Greg Ewing wrote:
Steven Bethard wrote:
py> def defaultdict(*args, **kwargs):
... defaultfactory, args = args[0], args[1:]
which can be written more succinctly as
def defaultdict(defaultfactory, *args, **kwargs):
...
Not if you want to allow the defaultfactory to be called wit
praba kar wrote:
Dear All,
I am new to Python. I want to know how to
work with ternary operator in Python. I cannot
find any ternary operator in Python.
http://www.python.org/peps/pep-0308.html
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[EMAIL PROTECTED] wrote:
Hello,
What's the problem with this code? I get the following error message:
File "test.py", line 26, in test
print tbl[wi][bi]
IndexError: index must be either an int or a sequence
---code snippet
from Numeric import *
tbl = zeros((32, 16))
def test():
val = t
Scott David Daniels wrote:
Roy Smith wrote:
... How our tools warp our thinking.
That is what it means to be human. I can think of no better reason
for a programmer to regularly learn languages: "our tools warp our
thinking." A programmer is a professionally warped thinker.
--Scott David Daniels
Marc 'BlackJack' Rintsch wrote:
def make_anagram_map(words):
anagram_map = dict()
for word in imap(lambda w: w.strip().lower(), words):
sorted_word = ''.join(sorted(list(word)))
anagram_map.setdefault(sorted_word, list()).append(word)
return dict(ifilter(lambda x: l
Raymond Hettinger wrote:
[Peter Otten]
Do you see any chance that list comprehensions will be redefined as an
alternative spelling for list()?
Not likely. It is possible that the latter spelling would make it possible
for
Py3.0. eliminate list comps entirely. However, they are very popular and
p
Maurice Ling wrote:
In the Java world, there is GATE (general architecture for text
engineering) and it seems very impressive. Are there something like that
for Python?
I worked with GATE this last summer and really hated it. Can't decide
whether that was just my growing distaste for Java or ac
Jeff Epler wrote:
The iterator for files is a little bit like this generator function:
def lines(f):
while 1:
chunk = f.readlines(sizehint)
for line in chunk: yield line
Inside file.readlines, the read from the tty will block until sizehint
bytes have been read o
Jeff Epler wrote:
On Sun, Apr 03, 2005 at 09:49:42PM -0600, Steven Bethard wrote:
Slick. Thanks!
does isatty() actually work on windows? I'm a tiny bit surprised!
Hmm... I was just talking about using iter(f.readline, ''), but it does
appear that isatty returns True for s
Michael Spencer wrote:
def __deepcopy__(self, memo={}):
from copy import deepcopy
result = self.__class__()
memo[id(self)] = result
result.__init__(deepcopy(tuple(self), memo))
return result
I know this is not your recipe, but is there any reason to use
Raymond Hettinger wrote:
[Steven Bethard]
and I often find myself alternating
between the two when I can't decide which one seems more Pythonic.
Both are pythonic.
Use a genexp when you need a generator
and use a listcomp when you need a list.
So do I read this right in preferring
[ fo
Skip Montanaro wrote:
Unittest's API is difficult enough for me to remember (at least the initial
framework I need to put together) that I generally hunt down some previous
unittest usage, clone it and start from there. I no longer have any idea
what the original unittest example was that got me s
Georg Brandl wrote:
Georg Brandl wrote:
Hello,
in follow-up to the recent "dictionary accumulator" thread, I wrote a
little module with several subclassed dicts.
Comments (e.g. makes it sense to use super), corrections, etc.? Is this
PEP material?
Docstrings, Documentation and test cases are to be
[EMAIL PROTECTED] wrote:
Michael Spencer wrote:
[EMAIL PROTECTED] wrote:
[snip]
Anyway, my present problem is that I want to make copies of
instances
of my own custom classes. I'm having a little trouble
understanding
the process. Not that I think that it matters -- but in case it
does,
I'll tell
SPJ wrote:
Hi,
I am new to python hence posing this question.
I have a file with the following format:
test11.1-1 installed
test11.1-1 update
test22.1-1 installed
test22.1-2 update
I want the file to be formatted in the following way:
test11.1-1 1.1-2
test22.1-1
Michael Spencer wrote:
BTW, as I mentioned in a previous comment, I believe this would be more
plainly written as type(self).__new__(), to emphasize that you are
constructing the object without initializing it. (There is a
explanation of __new__'s behaviour at
http://www.python.org/2.2/descrin
Axel Straschil wrote:
I solved all my problems for pythons multiple inheritance with this ng,
thaks to all again, but there is one think I still dislike:
class A(object):
def __init__(self, a=None, **__eat):
print "A"
super(A, self).__init__()
class B(object):
def __init__(self, b=None, **_
Derek Basch wrote:
Is there a better way to count iterations that this?:
pets = 0
for i in pets:
pets += 1
print "pet" + "#" + pets
for i, pet in enumerate(pets):
print 'pet#%i' % (i + 1)
STeVe
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jeremit0 wrote:
Steve Holden wrote:
If you want line numbers,. of course, then you can use
for linenum, line in enumerate(myfile.readlines()):
...
Remember that true to Python's philosophy numbering will start at zero.
Is this any better than:
lines = myfile.readlines()
for linenum
Andrew Dalke wrote:
"pet#%i" % (i+1)
(NOTE: most times that's written %d instead of %i)
Any reason to prefer %d over %i? The library reference seems to suggest
that they're the same thing[1]. I've typically used %i since I can
remember it from the int type, like I can remember %f from the floa
Edward C. Jones wrote:
#! /usr/bin/env python
"""Should this program take 4.3 seconds to run? I have a Linux PC with
an AMD Athlon XP 2000+ chip (1.7Gh). I use Python 2.4.1 and numarray
1.2.3, both compliled from source."""
import time, numarray
from numarray.numerictypes import *
nested = []
Edward C. Jones wrote:
Steven Bethard wrote:
> As mentioned, this has nothing to do with numarray, and everything to
> do with your inexplicable use of lists. Why don't you just write this
> as:
>
> arr = numarray.ones((8, 8, 256, 256), Float64)
The code I posted was simp
[EMAIL PROTECTED] wrote:
def funcSort(myList):
result = myList[:]
result.sort()
return result
In Python 2.4, funcSort is called sorted:
py> sorted([1.2,1.23,4.5,2])
[1.2, 1.23, 2, 4.5]
py> sorted(["a","c","b","A","C","B"])
['A', 'B', 'C', 'a', 'b', 'c']
STeVe
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http://mail.python.org/mailman
Brian van den Broek wrote:
Fredrik Lundh said unto the world upon 2005-04-11 10:14:
"fabian" wrote:
how testing if a variable exists in python as isset in php??
try:
variable
except NameError:
print "variable not set"
but that is really lousy Python; better make sure you always assign to
al
Uwe Mayer wrote:
Hi,
I've been looking into ways of creating singleton objects. With Python2.3 I
usually used a module-level variable and a factory function to implement
singleton objects.
With Python2.4 I was looking into decorators. The examples from PEP 318
http://www.python.org/peps/pep-0318.ht
ChinStrap wrote:
I am sorry if this is obvious, but I am not seeing it. How would I go
about creating a new type that is of the same type as a class sent into
the function?
new = foo.__init__() refers to the current foo, not a new fresh
instance of my class. The only way I can think of is to make
Uwe Mayer wrote:
I've been looking into ways of creating singleton objects.
It strikes me that I've never wanted or needed a singleton object.
Would you mind sharing your use case? I'm just curious.
Thanks,
STeVe
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Uwe Mayer wrote:
Tuesday 12 April 2005 06:36 am Steven Bethard wrote:
Uwe Mayer wrote:
I've been looking into ways of creating singleton objects.
It strikes me that I've never wanted or needed a singleton object.
Would you mind sharing your use case? I'm just curious.
I am using a
Fredrik Lundh wrote:
Or if you're using an application object (you should), just add a config object
to the application object (app.config.param = ...).
Do you have a link or two that describe what you mean by an "application
object"? The "you should" comment makes me think this is something of a
Uwe Mayer wrote:
Tuesday 12 April 2005 10:01 am Steven Bethard wrote:
I am using a class to manage configuration settings in an application.
This object should only existe once so that when the user
changes a setting through a configuration dialog the change imminent in
all locations where access
Scott David Daniels wrote:
Brian van den Broek wrote:
... STeVe stressed that the try/except solution is only really
appropriate for cases where the failure to have the variable defined
is quite rare.
Beware: C++ and Java have an immense overhead for exceptions. Python
has a very lightweight ex
James Stroud wrote:
Other than using modules, I thought @classmethod took care of this kind of
need:
class SingleThing:
some_values = {"fanciness":0}
def __init__(self):
raise Exception, "not enough preceding stars to be fancy enough"
@classmethod
def why_so_fancy(self):
print "wh
fred.dixon wrote:
i have read the book and searched the group too
--
im not gettin it.
i want to read a global (OPTIONS) from file1 from a class method
(func1) in file2
i want to understand how this works.
--
#f
praba kar wrote:
I have doubt regarding sorting. I have a list
that list have another list (eg)
list = [[1234,'name1'],[2234,'name2'],[0432,'name3']]
I want to sort only numeric value having array field.
How I need to do for that.
In Python 2.4:
py> import operator
py> seq = [(1234,'name1'),(2
vincent wehren wrote:
"praba kar" <[EMAIL PROTECTED]> schrieb im Newsbeitrag
news:[EMAIL PROTECTED]
| Dear All,
|
|I have doubt regarding sorting. I have a list
| that list have another list (eg)
|
| list = [[1234,'name1'],[2234,'name2'],[0432,'name3']]
-> Be careful, 0432 is octal notation f
F. Petitjean wrote:
Le Wed, 13 Apr 2005 01:13:40 -0600, Steven Bethard a écrit :
praba kar wrote:
list = [[1234,'name1'],[2234,'name2'],[0432,'name3']]
I want to sort only numeric value having array field.
How I need to do for that.
In Python 2.4:
py> import
Steven Bethard wrote:
See my other post in this thread. seq.sort() is not stable;
Hmmm... That didn't come out right. list.sort *is* stable. It's just
that if you want to sort only by the first element of each tuple in a
list, then list.sort won't produce results that are st
fred.dixon wrote:
I want to use OPTIONS as a global var.
In this particular case I am trying to set a global debug constant so I
can have some debug logging happen when my program is run with a
-debug option.
what will actuall end up in OPTIONS is OPTIONS.debug = True as i am
using optparse module.
Peter Hansen wrote:
Micheal wrote:
If I have os.path.walk(name, processDirectory, None) and processDirectory
needs three arguments how can I ass them because walk only takes 3?
The best answer to this is: if you aren't stuck
using a version of Python prior to 2.4, don't
use os.path.walk but use os.
Jim wrote:
Thanks for the suggestions. I guess I must ensure that this is my bottle
neck.
def readFactorsIntoList(self,filename,numberLoads):
factors = []
f = open(self.basedir + filename,'r')
line = f.readline()
tokens = line.split()
columns = len(tokens)
[EMAIL PROTECTED] wrote:
In my python books I find exclusive use of socket.close(). From my
other readings, I know about a "partial close operation". So, I figured
it would be useful to post some code about how socket.close() has an
implicit send in it and you can actually gain some clarity by bein
fred.dixon wrote:
how would i use the following if OPTIONS was in a module ?
---
from optparse import OptionParser
usage = "usage: %prog [options] arg"
parser = OptionParser(usage)
parser.add_option("-d", "--debug", ction="store_true", dest="verbose")
(OPTIONS = parser.parse_arg
Sara Khalatbari wrote:
Hi!
Suppose you're writing a module & writing the
definition of each function in that module in " or
""".
for example:
a) "This function does this & that"
or:
b) """This function does blah blah blah"""
What are the differences between " and """ ?
I'm using gedit & I wanna k
Jim wrote:
What I really want is a Numeric array but I don't think Numeric supports
importing files.
Hmmm... Maybe the scipy package?
I think scipy.io.read_array might help, but I've never used it.
STeVe
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http://mail.python.org/mailman/listinfo/python-list
fred.dixon wrote:
ok I'm sorry, I'm not sure what your doing there.
if i have to guess it looks like yo might me modifying the imported
modules dict with another dict.
Yes, this takes all the atrributes of the options object and sets them
as attributes of the module. If you're afraid of __dict__,
fred.dixon wrote:
#global1.py
import global2
import global3
import sys
constant = 'dumb'
option = sys.argv[1:]
pass
#global2.func1()
a=global2.class1()
a.func1()
print newvar
#global2.py
import __main__
pass
class class1:
def func1(self):
__main__.newvar = "string"
pass
The othe
Tuure Laurinolli wrote:
Someone pasted the original version of the following code snippet on
#python today. I started investigating why the new-style class didn't
work as expected, and found that at least some instances of new-style
classes apparently don't return true for PyInstance_Check, whic
Shane Hathaway wrote:
I like this PEP a lot, but your concern is valid. Maybe Brian could
modify the PEP slightly to disambiguate. How about using an ellipsis in
the argument list to signify suite-based keywords? Examples:
f(...):
x = 1
class C(object):
x = property(...):
doc = "I'm
Brian Sabbey wrote:
used, but rarely is because doing so would be awkward. Probably the
simplest real-world example is opening and closing a file. Rarely will
you see code like this:
def with_file(callback, filename):
f = open(filename)
callback(f)
f.close()
def print_file(file):
Kay Schluehr wrote:
Hmmm ... now You eliminate "where" completely in favor for '::'. This
may be reasonable because '::' is stronger and less context dependent.
But on the other hand it may be also reasonable to eliminate '::'
towards a stronger "where" ;)
x = property(**kw) where kw:
d
Tim N. van der Leeuw wrote:
Hi,
I'd like to remove keys from a dictionary, which are not found in a
specific set. So it's kind of an intersection-operation.
I can create a new dictionary, or a loop over all keys and test them
for set-membership, but I was wondering if there was a smart way to
expre
Gigi wrote:
I need access to a function object that corresponds to a frame object in
a certain case from inside the function.
I can get the frame object using:
f = sys._getframe(0)
But the resulting frame object doesn't contain the information I need.
There is a lot of information in the code ob
Tim N. van der Leeuw wrote:
In my taste, using generator expressions with conditions actually
doesn't look very readable; it hides the set-membership test under the
syntactic clutter.
You might try different indentation. I find that I write a lot of my
list comprehensions and generator expression
Ron wrote:
How about using ***name in the same way as *name, and **name are used?
It extends the current argument options in a consistent manner and 'I
believe' is easy to explain and visually says something different is
happening here.
This builds on the already present arg, *arg, **arg, and
Greg Ewing wrote:
Brian Sabbey wrote:
do f in with_file('file.txt'):
print f.read()
I don't like this syntax. Try to read it as an English sentence:
"Do f in with file 'file.txt'". Say what???
To sound right it would have to be something like
with_file('file.txt') as f do:
print f.read()
codecraig wrote:
Hi,
I have a question about how to define constants.
My directory structure looks like...
C:\
--> abc.py
--> utils
--> __init__.py
--> CustomThing.py
Ok, CustomThing looks like...
TOP = 0
LEFT = 1
class CustomThing:
def __init__(self):
self
Bernard A. wrote:
hello,
while trying to play with generator, i was looking for an idea to get
the position of a inner list inside another one, here is my first idea
:
- first find position of first inner element,
- and then see if the slice starting from here is equal to the inner
->
def subPo
Denis S. Otkidach wrote:
I believe it's a bad idea to remove this method, since behavior of both
"item in dict" and "for item in dict" (especially the later) in Python
does't seem sane to me. Just look at reverse operations:
dict.fromkeys(seq) <-> d.keys(), d.iterkeys() - OK
dict(iterable) <-> d.i
Charles Krug wrote:
List:
I'm working on some methods that operate on (mathematical) vectors as
in:
def Convolution(x, y)
"""Returns a list containing the convolution of vectors x and y"""
Is there any way to determine at runtime that x and y are iterible
collections?
Do I *coughs* simply *coughs*
Denis S. Otkidach wrote:
On Thu, 21 Apr 2005 08:50:25 -0600 Steven Bethard wrote:
SB> Huh? I'm not following your logic. Why is "item in dict" less
SB> readable than "dict.has_key(item)"? Something to do with expecting
SB> inverses that don't exist?
S
Fredrik Lundh wrote:
Steven Bethard wrote:
For me dictionary is a collection of key-value pairs, but not a
collection of keys (that's what set is).
Ahh, ok. Now I understand. I think you could probably search the
python-dev archives and see why the decision was made as it was. For
pretty
I have a list of strings that looks something like:
['O', 'B_X', 'B_Y', 'I_Y', 'O', 'B_X', 'I_X', 'B_X']
I need to group the strings into runs (lists) using the following rules
based on the string prefix:
'O' is discarded
'B_...' starts a new run
'I_...' continues a run started by
Michael Spencer wrote:
Steven Bethard wrote:
Bengt Richter wrote:
On Thu, 21 Apr 2005 15:37:03 -0600, Steven Bethard
<[EMAIL PROTECTED]> wrote:
I have a list of strings that looks something like:
['O', 'B_X', 'B_Y', 'I_Y', 'O',
Filip Dreger wrote:
Each function has a func_code property that is suposed to contain the
pure bytecode of the function. All the context (including reference to
relevant namespaces) is stored in different fields of the function
object. Since 'exec' is able to execute any string or bytecode in th
Filip Dreger wrote:
I am trying to find a way of executing functions without creating a
nested scope, so they can share local and global namespace (even if
they are declared in some other module).
Why? Can you explain what the use case is?
STeVe
--
http://mail.python.org/mailman/listinfo/python-
Filip Dreger wrote:
If I had a magic function 'exec in current scope' I would implement it
like this:
class actor:
def __init__():
self.roles=[]
def act():
for i in self.roles:
exec i in current scope
then the roles would simply be functions defined in any importable
file. For
Filip Dreger wrote:
Uzytkownik "Steven Bethard" <[EMAIL PROTECTED]> napisal w
wiadomosci news:[EMAIL PROTECTED]
See the documentation:
http://docs.python.org/ref/dynamic-features.html
"""The eval(), execfile(), and input() functions and the exec
statement
Richard Blackwood wrote:
Indeed, this language is math. My friend says that foo is a constant and
necessarily not a variable. If I had written foo = raw_input(), he would
say that foo is a variable.
Then what does he say if you write:
foo = 5
foo = 6
?
STeVe
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http://mail.python.org/mailman/list
Harlin Seritt wrote:
I have three tuples of the same size: tup1, tup2, tup3
I'd like to do something like this:
for a,b,c in tup1, tup2, tup3:
print a
print b
print c
Of course, you get an error when you try to run the pseudocode above.
What is the correct way to get this done?
for a, b, c
Robert Kern wrote:
Mike Meyer wrote:
Ok, we've added list comprehensions to the language, and seen that
they were good. We've added generator expressions to the language, and
seen that they were good as well.
I'm left a bit confused, though - when would I use a list comp instead
of a generator expr
James Stroud wrote:
Oops, last one had a typo:
a = ['bob', 'greg', 'cindy', 'alice']
b = ['fred','barney','betty','wilma','pebbles','bambam']
c = ['jed', 'granny', 'jethro', 'ellie-mae']
d = ['bob','carol','ted','alice']
e = [a,b,c,d]
for ary in e:
print ary
e.sort(lambda x,y:cmp(x[1],y[1]))
for
Lonnie Princehouse wrote:
Might as well make a class for Book instead of dealing with buckets of
lists...
class Book(object):
def __init__(self, title, author, publisher, isbn, date):# add
more fields according to CSV
self.__dict__.update(locals()) # lazy!
Just for any newbies not
googleboy wrote:
firstly, I am trying hard to figure out how to create a new file with
the list rather than print to standard out. I haev done this:
for book in books:
print book # just to be sure it works as I expect
sort1 = open(r'D:\path to\sort1.csv', 'w+')
print >
Lonnie Princehouse wrote:
So far, we've been using the "key" parameter of list.sort. If you want
sort criteria more complicated than a single attribute, you can sort
based on a custom comparison function.
Actually, the key= parameter can do anything the cmp= parameter can:
class Key(object):
d
Lonnie Princehouse wrote:
Likewise, the above is basically just an inefficient way of writing:
def date_key(book):
return book.data
def author_and_date_key(book):
return (author_key(book), date_key(book))
It's certainly more elegant, but I wanted to talk about the mechanics
of comparison fun
Dr. Peer Griebel wrote:
Why has [].__str__ a different type than object.__str__?
Why is object.__str__ a routine while object().__str__ not?
Well, I don't know why inspect.isroutine does what it does, but if you
really need to detect these, can you do something like:
py> MethodWrapperType = type(
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